FBA Dasd, Gonumber, Filesec, Fortran

EXLST m ac r o 291 expanded JCL 76 expiration date 548 extended MCS consoles 445 extended precision 334 extent exit 330

EXTENT statement 83 external side definition 571

functional reasons for migrating to OS/390 (continued) connectivity 11

staff availability 12 systems availability 11 systems management 10

functional RJE differences 219

F						GDG naming standards				408
F						general
Fast Copy		124, 397				Assembler considerations					311
FBA DASD		108, 120				comments on Language Environment 351
FCB						compatibility		135
incompatibilities				209		system considerations for CICS 136
naming differences					217	generation data groups				408
prefixes		217				generation data sets			551
specification			218			GET/PUT macros		301, 305
FCEPGOUT macro 290						GETIME macro		278
FDUMP compiler option					263	GETMAIN macro		276
fee-based installation				405		GETVIS & FREEVIS macros					289
FEOV macro		301				Global Services		519
FEOVD macro			309			glossary 565
FETCH macro			278			GONUMBER	336
field level sensitivity				172		Gregorian calendar definition					571
file						GRS 22
access methods				330		GSCD calls	172
attribute mismatches					258	GSTA calls	172
contents		546				guest considerations			430
control	234					guest support 29, 426
copy 35
definitions			72			H
handling considerations 257						H
migration		35				hardcopy library		412
names	124					hardcopy processing			393
organization			334			hardware configuration				402
shared	50					hardware consoles			443
status codes			257			hardware install and configure
support		346				DASD requirements				402
transfer		492				inter-systems connectivity

FILESEC 339	data transfer and NJE 405
final JCL conversion 516	shared DASD	404
final program conversion 517	tape drives	404

fixed window definition 571			terminal access		404
forcing an ABEND 344			OS/390 device support			402
Format-1 DSCB	108		other hardware requirements				403
Format-4 DSCB	108		processor requirements			402
Format-5 DSCB	109		hardware support	193
FORTRAN			help for hidden JCL problems 79
conversion considerations 349			hidden JCL 78
Language Environment-enabled 358			hidden JCL problems		79
VS FORTRAN in OS/390		349	high level
VS FORTRAN migration		358	language exits	364
FSS procedure	238		language programming interfaces 242
FUNCTION 339			Qualifier (HLQ)	544
functional comparison PSF/VSE and PSF/MVS 235			similarities 72
functional reasons for migrating 10			high-performance routing (HPR)				189
functional reasons for migrating to OS/390			historical perspective		50
applications availability		10

Index 601

OS/390 specifications

IBM OS/390, a versatile operating system, was a cornerstone in enterprise environments and played a pivotal role in mainframe computing. Released in the mid-1990s, OS/390 combined the strengths of IBM's MVS (Multiple Virtual Storage) with new features and enhancements, targeting scalability, reliability, and performance in demanding business applications.

One of the key features of OS/390 was its robust support for multiple users and processes. The system allowed thousands of concurrent users to access applications and data, ensuring high availability and minimizing downtime—a critical requirement for many large organizations. This scalability was supported through various enhancements in memory management and processor scheduling, enabling optimal resource allocation across diverse workloads.

OS/390 was known for its superior workload management capabilities. The Workload Manager (WLM) component allowed administrators to define service policies, specifying how system resources would be allocated according to the priority of tasks. This ensured that critical business processes received the necessary resources while less critical tasks were managed more flexibly.

Another significant characteristic of OS/390 was its commitment to security. The operating system provided comprehensive security features, including user authentication, data encryption, and auditing capabilities. This focus on security was vital for organizations handling sensitive data, ensuring compliance with regulations and safeguarding against unauthorized access.

OS/390 also supported advanced technologies that facilitated integration and development. The system included features like the IBM CICS (Customer Information Control System) for transaction processing and IMS (Information Management System) for database management. These technologies allowed organizations to build robust, high-performance applications tailored to specific business needs.

The ease of network integration was another strength of OS/390. With the advent of the Internet and global connectivity, OS/390 systems could easily interface with various network protocols, enabling businesses to operate in a connected world. This inclusion paved the way for many organizations to expand their capabilities and offer new services, driving digital transformation.

In conclusion, IBM OS/390 represented a significant advancement in mainframe technology, combining scalability, security, and robust workload management. Its rich feature set and support for critical enterprise applications solidified its role as a vital component of many organizations' IT infrastructures, ensuring they could meet their operational challenges head-on while supporting future growth. As technology continues to evolve, the legacy of OS/390 remains influential in the realm of computing.

IBM OS/390 manual FBA Dasd, Gonumber, Filesec, Fortran

Models: OS/390

FBA DASD

FCB

GONUMBER

hardware configuration

FILESEC 339

FORTRAN

FUNCTION 339

Index 601

OS/390 specifications